Better Burn

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Better Burn

Post by watercam on 6/11/2018, 4:25 pm

I know I am new here but have been shooting 1911s for some time. Wondering if anyone has tried using a less rounded firing pin stop to delay slide movement by nano seconds for a more complete powder burn?

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Re: Better Burn

Post by bruce martindale on 6/11/2018, 7:27 pm

Yes, in a ball gun to keep it closed longer. Hadn't considered burn.

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Re: Better Burn

Post by Doug Tiedt on 6/11/2018, 8:52 pm

Yes, put one in so that the extra friction would spread out the recoil impulse just a bit.  Of course, the extra friction also means I need to add powder to its favorite gentle load...  So, I don't think I gained
anything.

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Re: Better Burn

Post by watercam on 6/11/2018, 9:12 pm

Perhaps a middle of the road radius. Once I get these crazy ideas going I don't stop until I test it. Will post results!

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Re: Better Burn

Post by S148 on 6/11/2018, 10:22 pm

The slide and barrel have only moved a little bit before the bullet leaves the barrel in a 1911. And they are still locked together during that time, so I don't see how that could affect powder burn effectiveness.

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Re: Better Burn

Post by watercam on 6/11/2018, 11:54 pm

Ah yes, remember the slo-mo video now...

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Re: Better Burn

Post by willnewton on 6/12/2018, 6:38 am

Guys, the reason for the smaller radius on the firing pin stop is that it moves the fulcrum point of the slide/hammer lower on the hammer arm.

The lower point reduces the amount of leverage the slide has on the hammer.

With the smaller radius FPS, the slide dissipates more energy into moving the hammer rather than moving rearward, decreasing felt recoil.

Your need for this is based on your pistol and ammo setup.  Stronger recoiling setup, smaller radius. It has nothing to do with burn rate or friction, just leverage.

When using very light target loads or adding a slide mounted scope, there is questionable need for one, as you can tune the gun to the edge of reliability with ammo tuning and adjusting hammer and recoil springs alone.  I have guns that have them and guns that won’t function with one installed.

  Firing pin stops barely matter in the larger scheme of Bullseye in relation to things like being able to press the trigger without moving the sights.

Notice in posts here, how often new shooters look to their equipment to solve their problems and Masters look between their ears.

Always fun to experiment and learn new stuff though!
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Re: Better Burn

Post by watercam on 6/12/2018, 8:22 am

All true. The question was in regards to unburned powder left behind. The gun shoots fine, just wondering if there was a way to burn more powder and minimize powder flakes in the action. I used one to help burn slow powders in a CC pistol. It was successful in that usage.
The original prints by John Browning had a reduced radius FPS. The more rounded version was to make the slide easier to rack for mounted cavalry ...

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Re: Better Burn

Post by Wobbley on 6/12/2018, 8:22 am

Some pistols had that portion of the hammer relieved. The one in my avatar is like that.
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Re: Better Burn

Post by Wobbley on 6/12/2018, 8:24 am

If you want to fix unturned powder, either add more powder or add more crimp. What is your current reload?
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Re: Better Burn

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